Hi all,
It seems R has gotten better/more packages in dealing with time data.
I want to create "simple" summaries of time for bat activity.
Data is all in an Access relational database and exported as a CSV file
with 4 columns in this format:
Species = a 6 letter code or "Buzz" to indicated when bats are feeding
Location = a 4 digit number
Date= MMDDYYYY
Time=HH:MM (24 hr format)
Species Location Date Time
Buzz 7716 1/25/2000 0:05
Buzz 7716 1/25/2000 0:05
Buzz 7716 1/25/2000 0:05
Buzz 7716 1/25/2000 0:47
Buzz 7716 1/25/2000 0:47
Buzz 7716 1/25/2000 0:47
Buzz 7716 1/25/2000 0:47
Buzz 7717 7/3/2000 20:17
Buzz 7717 7/3/2000 20:17
Buzz 7717 7/3/2000 20:17
Buzz 7717 7/3/2000 20:17
Buzz 7717 7/3/2000 20:30
Buzz 7717 7/3/2000 20:30
Buzz 7717 7/3/2000 20:30
Buzz 7717 7/3/2000 20:30
Ptedav 7717 7/3/2000 20:14
Ptedav 7717 7/3/2000 20:15
Ptedav 7717 7/3/2000 20:15
Ptedav 7717 7/3/2000 20:15
Ptedav 7717 7/3/2000 20:15
Ptedav 7717 7/3/2000 20:15
Ptedav 7717 7/3/2000 20:17
Ptedav 7717 7/3/2000 20:17
Ptedav 7717 7/3/2000 20:17
Ptedav 7717 7/3/2000 20:18
Ptedav 7717 7/3/2000 20:18
Ptedav 7717 7/3/2000 20:18
Ptedav 7717 7/3/2000 20:18
Ptedav 7717 7/3/2000 20:18
Ptemes 7717 7/3/2000 23:15
Ptemes 7717 7/3/2000 23:21
Ptemes 7717 7/3/2000 23:22
Ptemes 7717 7/3/2000 23:23
Ptemes 7717 7/3/2000 23:25
Ptemes 7717 7/3/2000 23:26
Ptemes 7717 7/3/2000 23:27
Ptemes 7717 7/3/2000 23:28
Ptemes 7717 7/3/2000 23:29
Ptemes 7717 7/3/2000 23:33
Ptemes 7717 7/3/2000 23:35
Ptemes 7717 7/3/2000 23:36
Ptemes 7717 7/3/2000 23:37
The above is clearly not a complete DF but only a format sample. Data
begins when the first bat was recorded and ends when the last bat was
recorded. So all are times from sunset to sunrise. Dates roll over so
for example one night of data would begin at 18:00 1/1/2000 and end
06:00 1/2/2000.
What I need to do is have a summary of Buzz events (feeding) and
calculate the percentage of total time bats were active and have a
summary of time feeding buzz was recorded and total bat activity to
determine what percentage of time was spent with feeding attempts over
the active period.
This by all bats by survey night and by single species by survey night.
Any suggestions welcomed.
Happy holidays all
--
Bruce W. Miller, PhD.
Neotropical bat risk assessments
Conservation Fellow - Wildlife Conservation Society
If we lose the bats, we may lose much of the tropical vegetation and the lungs
of the planet
Using acoustic sampling to identify and map species distributions
and pioneering acoustic tools for ecology and conservation of bats for >25
years.
Key projects include providing free interactive identification keys and call
fact sheets for the vocal signatures of New World Bats
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